Large magnetorefractive effect in magnetite

J. M. Caicedo, S. K. Arora, R. Ramos, I. V. Shvets, J. Fontcuberta, G. Herranz

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We carried out a magneto-optical spectroscopic study of magnetite (Fe 3O4) thin films and single crystals at optical wavelengths. We observed a relevant quadratic magneto-optic contribution that can be notably larger than first-order linear magneto-optics at some range of wavelengths in the visible region. These unusual quadratic effects are particularly strong at the Verwey temperature (100-120K) and decay slowly away from this transition temperature. We attribute this remarkable magneto-optical response to a magnetorefractive effect associated with the field-dependent polaronic conductivity at optical frequencies, which interestingly enough is already noticeable at room temperature.

Original languageEnglish
Article number103023
JournalNew Journal of Physics
Volume12
DOIs
Publication statusPublished - 2010 Oct 14
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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